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Hello all,
I've developed a portable DOS
script for Windows that allows for vlab to run from a shared java JRE on a
student's portable USB flash drive, saving space on the small CF drives.
With certain jar distributions, either DOS and/or Java.exe have a problem with
relative paths (lacking a root drive). To solve this I devised this method to
set the DOS path to the JRE subdirectory (absolutely path). Another method would
be to use subst.exe (substitute) to virtual mount a subdir as an absolute drive
letter. Although less complex the use of subst.exe could lead to drive
assignment conflicts in school LAN environments.
The method I use would be less
offensive to sys admin sensibilities and saves space on USB flash drives. In my
usage I've been able to share a JRE between Vlab, GeoGebra, GeoNext,
Jmol, Alice, using the Pstart.exe portable applications launcher. The
Italian portable applications collections, WinPenPack, use an interesting "X
Drive" mechanism to launch applications, it might be more flexible than my
clunky DOS scripts.
Hope this helps. -- Lee ============================
:: geogebra.cmd ============================ :: set Java application jar file set APP=geogebra-2.6b.jar ::======================== ::Use this DOS script ( .bat or .cmd ) ::======================== :: traverse as high to thumb drive's "root" dir as necessary :: in my case the path looks like this: \apps\math-geogebra, so I need :: to call ".." twice to go up-folder 2x. pushd ..\..\ :: parse off the current drive letter & "root path" :: (nice for testing where you don't have the same directory tree :: as on the deployed/live Thumb Drive) :: the path will not include a trailing "\" but that could be :: concatenated at the end with a \ for /F "eol=; tokens=* delims=+++ " %%1 in ('cd') do set usbbasepath=%%1 :: return to orig. folder/directory popd :: temporarily set search path for Java JRE :: JRE relative path hardcoded here but could be parameterized :: at beginning of script set path=%PATH%;%usbbasepath%\apps\shared-jre\jre1.5.0_06\bin :: Set APP_HOME to the Jmol installation directory. :: Parse out directory path, use an unlikely delimiter "+++" :: so that spaces in path don't break path for /F "eol=; tokens=* delims=+++ " %%1 in ('cd') do set APP_HOME=%%1 :: if the path is empty then use . (current dir) if "%APP_HOME%x"=="x" set APP_HOME="." :: build temporary command file :: this was necessary due to problems with windows environment :: & start.exe parsing string concatenation echo start /b /d"%usbbasepath%\apps\shared-jre\jre1.5.0_06\bin\" javaw.exe -Xmx512m -jar "%APP_HOME%\%APP%" > ztmprun.cmd :: run the temporary command file ztmprun.cmd |